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Aehr Test Systems AEHR

US equityMarket cap rank #2391Semiconductor Equipment & Materials
$104.40 −$2.81 (-2.62%)
Market closed · Oct 6, 12:30 am ET · Last extended-hours $105.51 +1.06%
Open$107.32
Prev close$107.21
Day range$101.53 – $108.10
Volume2.08M
Market cap$3.41B
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership75.4%+0.66 pts vs. prior quarter
Institutions holding319+3 vs. prior quarter
Insider trades (recent)7 buys / 43 sellsNet selling
Short interest15.67% of floatDays to cover 1.5 · as of 15 Sep 2026
Short-sale volume share15.7%5-day average of daily volume

Short-sale volume as % of daily volume

12%14%17%19%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$19.09M (8 inflow days, 12 outflow days).

The five largest holders on file together own 25.1% of shares outstanding.

Largest holders

  • BlackRock8.15%
  • Jane Street Group, LLC5.05%
  • Vanguard Capital Management, LLC4.70%
  • D. E. Shaw & Co., L.P.3.61%
  • Two Sigma Investments, LP3.57%
  • FMR3.09%
  • Vanguard Portfolio Management, LLC2.96%
  • Geode Capital Management, LLC2.68%

By investor type

  • Mutual Fund46.32%
  • Hedge Fund15.38%
  • Private Company6.24%
  • Public Company6.09%
  • Individual/Insider4.14%
  • Government Pension Fund0.73%
  • VC/PE Fund0.29%
  • Family Office/Trust0.20%

Reported short interest has risen from 13.24% to 15.67% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 5,118,430 15.7% 1.5
31 Aug 2026 4,349,980 13.3% 2.0
14 Aug 2026 4,342,530 13.3% 1.7
31 Jul 2026 4,292,682 13.2% 1.4
15 Jul 2026 4,811,203 14.8% 1.4
30 Jun 2026 4,164,166 13.2% 2.9

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